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Marketable Securities (Tables) | 6 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Summary of Marketable Securities | The amortized cost and fair value of marketable securities as of the dates indicated below were as follows:
As of December 31, 2019 (In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate debt securities | $ | 385,444 |  |  | $ | 623 |  |  | $ | (32 | ) |  | $ | 386,035 |
Money market funds and other | 435,933 |  |  | — |  |  | — |  |  | 435,933 |
Municipal securities | 9,212 |  |  | 9 |  |  | (3 | ) |  | 9,218 |
Sovereign securities | 6,005 |  |  | 8 |  |  | — |  |  | 6,013 |
U.S. Government agency securities | 94,739 |  |  | 50 |  |  | (13 | ) |  | 94,776 |
U.S. Treasury securities | 247,182 |  |  | 239 |  |  | (37 | ) |  | 247,384 |
Subtotal | 1,178,515 |  |  | 929 |  |  | (85 | ) |  | 1,179,359 |
Add: Time deposits(1) | 85,667 |  |  | — |  |  | — |  |  | 85,667 |
Less: Cash equivalents | 527,368 |  |  | — |  |  | — |  |  | 527,368 |
Marketable securities | $ | 736,814 |  |  | $ | 929 |  |  | $ | (85 | ) |  | $ | 737,658 |
As of June 30, 2019 (In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate debt securities | $ | 433,518 |  |  | $ | 141 |  |  | $ | (582 | ) |  | $ | 433,077 |
Money market funds and other | 352,708 |  |  | — |  |  | — |  |  | 352,708 |
Municipal securities | 1,910 |  |  | 3 |  |  | — |  |  | 1,913 |
Sovereign securities | 6,001 |  |  | 1 |  |  | (8 | ) |  | 5,994 |
U.S. Government agency securities | 159,454 |  |  | 5 |  |  | (241 | ) |  | 159,218 |
U.S. Treasury securities | 208,058 |  |  | 39 |  |  | (401 | ) |  | 207,696 |
Subtotal | 1,161,649 |  |  | 189 |  |  | (1,232 | ) |  | 1,160,606 |
Add: Time deposits(1) | 99,006 |  |  | — |  |  | — |  |  | 99,006 |
Less: Cash equivalents | 536,206 |  |  | 17 |  |  | (2 | ) |  | 536,221 |
Marketable securities | $ | 724,449 |  |  | $ | 172 |  |  | $ | (1,230 | ) |  | $ | 723,391 |
________________ (1) Time deposits excluded from fair value measurements.
Investments with Gross Unrealized Losses | The following table summarizes the fair value and gross unrealized losses of our investments that were in an unrealized loss position as of the date indicated below, $68.3 million of which were in a continuous loss position for 12 months or more:
As of December 31, 2019 (In thousands) | Fair Value |  | Gross Unrealized Losses
Corporate debt securities | $ | 88,354 |  |  | $ | (32 | )
Municipal securities | 3,671 |  |  | (3 | )
U.S. Government agency securities | 37,246 |  |  | (13 | )
U.S Treasury securities | 87,526 |  |  | (37 | )
Total | $ | 216,797 |  |  | $ | (85 | )
Contractual Maturities of Securities | The contractual maturities of securities classified as available-for-sale, regardless of their classification on our Condensed Consolidated Balance Sheets, as of the date indicated below were as follows:
As of December 31, 2019 (In thousands) | Amortized Cost |  | Fair Value
Due within one year | $ | 386,442 |  |  | $ | 386,617 |
Due after one year through three years | 350,372 |  |  | 351,041 |
| $ | 736,814 |  |  | $ | 737,658 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
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